Analog Devices Inc. AD674BJNZ

Overview

AD674BJNZ from Analog Devices is a complete monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with integrated voltage reference, clock generator, and three-state digital output buffers. It supports 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V input ranges; operates on +5 V logic, +12/+15 V analog, and –12/–15 V analog supplies; and delivers 15 µs maximum conversion time. It serves as a high-speed, pin-compatible upgrade to the AD574A in industrial data acquisition and test instrumentation systems.

For engineers reviewing the AD674BJNZ datasheet, AD674BJNZ pinout, AD674BJNZ application, or AD674BJNZ equivalent, this page provides verified technical context, validated pin functions, confirmed input range behavior, real-world interface timing constraints, and two rigorously cross-referenced alternative parts for direct system-level evaluation.

Technical Context

The AD674BJNZ implements a SAR architecture with an on-chip 12-bit current-output DAC, precision comparator, and laser-trimmed thin-film resistor network for scaling and bipolar offset. Its internal 10.00 V ±1% reference drives both the DAC and external loads up to 2.0 mA, with 10 ppm/°C typical temperature coefficient.

It supports dual-mode digital interfacing: full 12-bit parallel word reads or byte-oriented 8-bit+4-bit transfers via A0 and 12/8 control pins, with CE-activated timing and STS status flag signaling conversion completion. Input impedance is 5 kΩ (10 V span) or 10 kΩ (20 V span), and dynamic loading during conversion requires stable source impedance ≤100 Ω for <±0.5 LSB error.

Key Specifications

Pinout & Package

AD674BJNZ is supplied in a 28-lead plastic DIP (N-28 package), with 0.6-inch body width and standard through-hole footprint compatible with legacy AD574A layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit ADC applications.

Compared with AD674BJNZ, AD7819BRUZ offers faster conversion and lower supply voltage but sacrifices bipolar range support and reference drive; ADS7800U reduces part cost but increases system complexity with mandatory external reference and clock - making AD674BJNZ optimal for legacy AD574A upgrades demanding minimal redesign.

Availability

AD674BJNZ is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment manufacturing, avionics subsystem integration, and medical diagnostic instrumentation requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD674BJNZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD674B series belongs to Analog Devices' legacy precision ADC product line, designed specifically for high-accuracy, pin-compatible replacement of industry-standard converters like the AD574A in industrial and military-grade instrumentation.

FAQ

What is the maximum conversion time specification for AD674BJNZ?

The AD674BJNZ has a maximum conversion time of 15 µs for the full 12-bit cycle, as guaranteed across its specified 0°C to +70°C operating temperature range. This value is measured under worst-case supply conditions (+16.5 V VCC, –16.5 V VEE, +5.5 V VLOGIC) and includes setup, approximation, and status assertion delays. The 8-bit short-cycle mode completes in 10 µs max, useful for coarse-resolution preprocessing prior to full conversion.

Does AD674BJNZ require external clock circuitry?

No, AD674BJNZ does not require external clock circuitry. It integrates a precision on-chip clock generator optimized for the SAR conversion process. The internal clock is factory-tuned and temperature-compensated, eliminating the need for external crystals, oscillators, or timing resistors - a key differentiator from earlier-generation ADCs like the AD574A that relied on external timing components.

Can AD674BJNZ operate with only +5 V and ground supplies?

No, AD674BJNZ cannot operate with only +5 V and ground. It requires three independent supplies: +5 V (VLOGIC, Pin 1), +12 V or +15 V (VCC, Pin 7), and –12 V or –15 V (VEE, Pin 11). The analog section uses bipolar supplies to support ±5 V and ±10 V input ranges and to bias the internal DAC and comparator. Omitting VEE or VCC will prevent conversion or damage the device.

How is the reference voltage used in AD674BJNZ calibrated?

The AD674BJNZ internal 10.00 V reference is laser-trimmed at wafer sort to ±1% initial accuracy and exhibits 10 ppm/°C typical temperature drift. Calibration is performed at the die level using thin-film resistor networks; no user trimming is required for standard operation. For enhanced full-scale accuracy, a 50 Ω ±1% metal film resistor may be placed between REF OUT (Pin 8) and REF IN (Pin 10), as documented in Figure 7 of the datasheet.

Is AD674BJNZ pin-compatible with AD574A?

Yes, AD674BJNZ is fully pin-compatible with the AD574A, sharing identical pin numbering, signal definitions, and mechanical footprint (28-lead DIP). This allows direct replacement in existing designs without PCB modification. Key improvements include faster 15 µs conversion (vs. 35 µs for AD574A), lower power consumption, and integrated clock/reference - all while maintaining functional and timing compatibility in full-control mode.